Improvement in hoisting-machines



P. W. MELLEN.

Hoisting-Machines.

Patented July 15, 1873.

INVENTR: www1/www UNITED STATES ArEN'r EEIcE.A

PETER w. MELLEN, oE ST. LOUIS, MISSOURI.

IMPROVEMENT IN HISTING-MACHINES.

Specification forming part of Letters Patent No. 140,786, dated July l5,1873; application filed April 2, 1873.

To all whom it may concern:

Be it known that I, PETER W. MELLEN, of the city and county of St. Louisand State of Missouri, have invented a certain Improvement in HandHoiSting-Machines, of which the following is a Specification:

My invention consists, first, in the manner of operating thebrake, viz.,by means of a screw-shaft provided with pulley and operatingcheck-rope,l by which the screw-shaft is rotated backward or forward tooperate a pivoted brake-lever. My invention consists, second, in thearrangement of a counterbalanceweight in suitable vertical slides at theside of the hatchway, and secured to the platform- `rope by a pulley orhanger on said rope,

which has free horizontal movement on a slide-rod or bail secured to thetop of the weight.

The purpose of the described connection of the rope andcounterbalance-weight is to allow the rope side movement to accommodateits position on the weight to that on the drums when the weight is drawnup in close proximity to the idler-drum, the rope-hanger being thendrawn to one end of the bail, and returning to a central position as therope runs out over the drum and the weight descends, so as to retain anearly vertical position.

Figure l is a rear perspective view of my improvement with parts of theframe-supports removed. Fig. 2 is a detail section of parts of thescrew-brake in a modiiied form.

A is the platform, of any suitable form and construction, arranged tomove on slides A', and provided with safety-dogs a and springattachments a. B is the platform-rope, secured to the platform, andpassing up between the hoisting-drums C C', and around the drum G; thenover the idler-drum C', and vertically downward to connect with thecounterbalance-weight D.

One of the hoisting-drums is formed with a Spiral right-hand? groove, inwhichthe rope B lies, and the other drum is formed with a left-handspiral groove, for the purpose of causing the rope to move in the samedirection endwise on both drums 0 C.

The drum C is actuated, in the usual manner, by spur-gearin g E, groovedpulley F, and endless rope Gr.

The weight D is arranged between slides D', and guided thereon byanti-friction rollers d, and the weight is connected to the end of therope B by a hanger, H, (secured to the rope,) which passes under theslide rod or bail d', Secured to the weight D.

The hanger has an anti-friction roller, h, to allow its free movementbeneath the bail d', in accord with the movement of the rope along thedrum C.

rEhe weight D, with its slides D', may be arranged inside the hatchwayin places where the hatchway is required to be boxed up, or it` maybefarran ged within a suitable trunk passing through the floors at theside of the hatchway.

I is the brake-lever, pivoted at c' in the frame that supports thegrooved pulley F. J is the brake-shoe, secured to the lever I.

The brake-shoe J operates upon one or both sides of the periphery ofpulley F, which may be flanged on one or both sides to give a broaderbearing for the rubber or shoe.

The lever I is provided with a pivoted boX- nut, t', through whichpasses the operating screw-Shaft K, supported in proper bearings in theframe of the machine.

L is a pulley keyed `on the screw-Shaft K, around which is wound theoperating brake or check rope k, which Should be an endless rope, andwhich is arranged inside the hatchway, within easy reach of the operatorwhen standing on the platform, in all positions of the latter.

In the'modification Shown in Fig. 2 the pulley L is supported in aproper bearing to prevent its endwise movement, and is axiallyscrew-threaded to receive the screw-threaded end of the bar K, attachedto the sliding block j of the brake-shoe J, and as the pulley is turnedby the check-rope 7c the brake is applied to or drawn away from the,hand-rope pulley F.

I claim as my invention-n 1. In combination with the check-rope k,pulley L, screw-Shaft K, lever I, and shoe J,

the pivoted nut if, enabling positive movedrums C C', hanger H h, baild', and weight ment to be imparted to the brake in both di- D, allarranged substantiallyas and for the reotions. purpose set forth.

2. The combination of the rope B, hanger PETER W. MELLEN. H h, bail orslide-rod d', and weight D, all Witnesses: substantially as and for thepurpose set forth. SAML. KNIGHT,

3. The combination of the platform-rope B, ROBERT BURNS.

